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Python random Data generation Exercise to master random data generation techniques

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Python random data generation Exercise to master random data generation techniques.

This random number generation exercise questions is to help Python developer quickly learn the various techniques of how to generate random numbers and data in Python. This random number generation exercise and challenge helps you to understand the Python random module, secrets module, and its methods.

What is included in this exercise?

  • Now it has 10 exercise question.
  • The solution is provided at the end of each question.
  • Each question contains a specific skill you need to learn.

When you complete each question you get more familiar with random data generation techniques in Python. Practice Questions using Code Editor

Tips and helpful learning resources are provided for each question, which helps you to solve the exercise. I request you to solve all the questions by yourself. After you are done with your solution, you can refer my answer.

Refer to the following tutorials to solve the exercise.

Question 1: Generate 3 random integers between 100 and 999 which is divisible by 5

Reference article for help: 

Marks: 5

import random

print("Generating 3 random integer number between 100 and 999 divisible by 5")
for num in range(3):
    print(random.randrange(100, 999, 5), end=', ')

Question 2: Random Lottery Pick

Lottery game –  Generate a 100 Lottery tickets and pick two lucky tickets from it as a winner.

Note you must adhere to the following conditions:

  • Lottery number must be 10 digits long.
  • All 1000 ticket number must be unique.
Hint: Generate a random list of 100 numbers. Use random.randrange()   for number generation and random.sample() method to pick lucky 2 tickets.

Reference article for help: 

Marks: 15

import random

lottery_tickets_list = []
print("creating 100 random lottery tickets")
for i in range(100):
    lottery_tickets_list.append(random.randrange(1000000000, 9999999999))

winners = random.sample(lottery_tickets_list, 2)
print("Lucky 2 lottery tickets are", winners)

Question 3: Generate 6 digit random secure OTP

Reference article for help: 

Marks: 5

import secrets

#Getting systemRandom class instance out of secrets module
secretsGenerator = secrets.SystemRandom()

print("Generating 6 digit random OTP")
otp = secretsGenerator.randrange(100000, 999999)

print("Secure random OTP is ", otp)

Question 4: Pick a random charcter from a given String

Reference article for help: random.choice()

Marks: 5

import random

name = 'pynative'
char = random.choice(name)
print("random char is ", char)

Question 5: Generate  random String of length 5

Note: String must be the combination of the UPPER case and lower case letters only. No numbers and a special symbol.

Reference article for help: Generate random String in Python.

Marks: 10

import random
import string

def randomString(stringLength):
    """Generate a random string of 5 charcters"""
    letters = string.ascii_letters
    return ''.join(random.choice(letters) for i in range(stringLength))

print ("Random String is ", randomString(5) )

Question 6: Generate a random Password which meets the following conditions

  • Password length must be 10 characters long.
  • It must contain at least 2 upper case letter, 2 digits, and 2 special symbols.

Reference article for help:

Marks: 15

Question 7: Calculate mutiplication of two random float numbers

Note:

  • First random float number must be between 0.1 and 1
  • Second random float number must be between 9.5 and 99.5

Reference article for help:

Marks: 5

import random

num1  = random.random()
print("First Random float is ", num1)
num2 = random.uniform(9.5, 99.5)
print("Second Random float is ", num1)

num3 = num1 * num2
print("Multiplication is ", num3)

Question 8: Generate random secure token of 64 bytes and random URL

Reference article for help:

Marks: 10

import secrets

print("Random secure Hexadecimal token is ", secrets.token_hex(64))
print("Random secure URL is ", secrets.token_urlsafe(64))

Question 9: Roll dice in such a way that every time you get the same number

Dice has 6 number(from 1 to 6). Roll dice in such a way that every time you must get same output number. do this 5 times.

Reference article for help:

Marks: 15

import random

dice = [1, 2, 3, 4, 5, 6]
print("Randomly selecting same number of a dice")
for i in range(5):
    random.seed(25)
    print(random.choice(dice))

Question 10: Generate a random date between given start and end dates

Marks: 15

import random
import time

def getRandomDate(startDate, endDate ):
    print("Printing random date between", startDate, " and ", endDate)
    randomGenerator = random.random()
    dateFormat = '%m/%d/%Y'

    startTime = time.mktime(time.strptime(startDate, dateFormat))
    endTime = time.mktime(time.strptime(endDate, dateFormat))

    randomTime = startTime + randomGenerator * (endTime - startTime)
    randomDate = time.strftime(dateFormat, time.localtime(randomTime))
    return randomDate

print ("Random Date = ", getRandomDate("1/1/2016", "12/12/2018"))

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Comments

  1. Q2 – Sorry, but I’m afraid your solution is incorrect: it does not preclude duplicate ticket numbers being generated. For example, substituting smaller values into your solution for demonstration purposes:
    import random
    lottery_tickets_list = []
    print(“creating 10 random lottery tickets”)
    for i in range(10):
    lottery_tickets_list.append(random.randrange(10, 20))
    print(lottery_tickets_list)
    typically results in duplicate-riddled output like this:
    creating 10 random lottery tickets
    [18, 16, 13, 13, 16, 10, 10, 14, 11, 16]

    My solution uses a set rather than a list to achieve the correct result:
    import random
    tickets = set()
    while len(tickets) < 100:
    tickets.add(random.randrange(1000000000, 10000000000))
    print('Drum roll…')
    print('and the lucky winners are numbers:')
    winners = random.sample(tickets, 2)
    print(f'{winners[0]} and {winners[1]}')
    ;;; which outputs
    Drum roll…
    and the lucky winners are numbers:
    8975225689 and 1386699143
    Note also the use of 10000000000 as the top of the range value rather than your 9999999999 because the end-point for the range is exclusive. (The same comment applies to Q1, although this does not affect the outcome.)

    Reply

  2. Q5 – badly worded. “String must be the combination of the UPPER case and lower case letters only. No numbers and a special symbol.”
    Thus can only be interpreted as requiring a string comprised of letters (any case – or arguably a mix of cases) plus a special symbol. (A slightly more difficult problem which I addressed.)
    I suggest re-wording it as “The string must contain only upper and/or lower case alphabetic characters..” There is no need for your second sentence.

    Reply

  3. Q6 – Hmm. I hadn’t come across the shuffle function, so rather than code one myself, I arrived at this alternative solution. It is obviously less efficient than your answer, but given the scale of the problem the timing difference is not of practical significance.
    import string, secrets
    s = string.ascii_letters + string.digits + string.punctuation
    pw = ”
    uc = 0
    dg = 0
    sp = 0
    while len(pw) < 10:
    z = secrets.choice(s)
    if z in string.ascii_uppercase: uc += 1
    elif z in string.digits: dg += 1
    elif z in string.punctuation: sp += 1
    pw += z
    if len(pw) == 10:
    #Does it meet the criteria? If not, ditch it and try again
    if uc < 2 or dg < 2 or sp < 2:
    pw = ''
    uc = dg = sp = 0
    print(pw)

    Reply

  4. Q10 – I think your solution is unnecessarily complicated. I offer my simpler solution:
    import random, datetime as dt
    start_date = dt.date(2019, 1, 1)
    print(f’Start of period = {start_date}’)
    end_date = dt.date(2019, 12, 25)
    print(f’End of period = {end_date}’)
    delta = (end_date – start_date).days
    r = random.randint(0, delta)
    r_date = start_date + dt.timedelta(days = r)
    print(f’Random date = {r_date}’)
    Start of period = 2019-01-01
    End of period = 2019-12-25
    Random date = 2019-04-14

    Reply

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